论文标题
通过快速ASKAP连续调查对集成的Sachs-Wolfe效应的测量
A measurement of the Integrated Sachs-Wolfe Effect with the Rapid ASKAP Continuum Survey
论文作者
论文摘要
由于宇宙的加速膨胀，重力在大尺度上的演变是对暗能量的重要且独立的探针，称为综合的sachs-wolfe（ISW）效应。我们通过与最近的快速ASKAP Conteruum Survey（RACS）的无线电连续性星系分布图（RACS）的无线电星系分布图（RACS）从普朗克卫星（RACS）互相相关的宇宙微波背景图来衡量这种ISW效果。我们检测到$ \ sim 2.8 \，σ$的正相关相对于无相关性的零假设。我们通过振幅参数来参数ISW效应的强度，并发现约束为$ a _ {\ mathrm {isw}} = 0.94^{+0.42} _ { - 0.41} $，这与当前ConcorDance Cosordance Cosmolocic Model Model Model Model Model $ cdm $ cdm Cdm cosordance cosordance cosordance cosordance cosordance cosordance cosordance cosordance cosordise coscdm cdm cdm cdm一致。此参数的可信间隔与不同的偏置模型和红移分布无关，这些模型和红移分布在滋扰参数上被边缘化时被考虑。我们还检测到大尺度（$ \ ell \ leq 40 $）的星系自动相关角功率谱中的功率过量，并研究可能的系统原因。
The evolution of the gravitational potentials on large scales due to the accelerated expansion of the Universe is an important and independent probe of dark energy, known as the integrated Sachs-Wolfe (ISW) effect. We measure this ISW effect through cross-correlating the cosmic microwave background maps from the Planck satellite with a radio continuum galaxy distribution map from the recent Rapid ASKAP Continuum Survey (RACS). We detect a positive cross-correlation at $\sim 2.8\,σ$ relative to the null hypothesis of no correlation. We parameterise the strength of the ISW effect through an amplitude parameter and find the constraints to be $A_{\mathrm{ISW}} = 0.94^{+0.42}_{-0.41}$, which is consistent with the prediction of an accelerating universe within the current concordance cosmological model, $Λ$CDM. The credible interval on this parameter is independent of the different bias models and redshift distributions that were considered when marginalising over the nuisance parameters. We also detect a power excess in the galaxy auto-correlation angular power spectrum on large scales ($\ell \leq 40$), and investigate possible systematic causes.
